JPH0516340U - Ink ribbon cassette - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To provide an ink ribbon cassette that is free from the possibility that the ink ribbon may be picked up on the recording paper at the time of printing to cause printing failure, or the ink ribbon may meander or sag. A reversible ink ribbon cassette 4 in which a back tension applying means 5 for the ink ribbon 1 and a slack removing means 6 for the ink ribbon 1 are arranged,
A pair of back tension imparting portions 51 and 52 each having an ink ribbon contact portion at the tip end are connected to each other at their base ends in a substantially U-shape by connecting portions with the ink ribbon contact portions facing outward and separated from each other. One spring 50 urged in the direction of the spring 50 and a pair of parallel projections 54, 5 for loosely fitting the connecting portion of the spring 50 at a predetermined interval.
5, the connecting portion 53 of the spring 50 is loosely fitted in the space L, and the pair of back tension applying portions 51, 52 are provided.
The respective ink ribbon contact portions were respectively brought into contact with the surfaces of the ink ribbon 1 in the pair of winding / supply hubs 2 and 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink ribbon cassette that can be used in reverse, and more particularly to an ink ribbon cassette that is free from the risk of printing defects such as ink ribbon being caught on a recording paper, causing the ink ribbon to meander or sag.

[0002]

[Prior Art]

 A general ink ribbon cassette has a slack removing spring that removes the slack of the ink ribbon and a back tension applying spring that applies back tension to the ink ribbon during winding to prevent the ink ribbon from meandering. .

In the ink ribbon cassette of the ink ribbon cassette, which can be used in reverse, a pair of hubs arranged in the cassette are used as winding hubs. The side walls are arranged on the sides of the take-up / supply hubs so that the back tension acts on the supply-side ink ribbon when the ink ribbon is taken up by any of the hubs.

[0004]

[Problems to be solved by the device]

 However, in the above-described ink ribbon cassette that can be used in reverse, since back tension applying springs are arranged at the left and right positions inside the cassette, the back tension also acts on the ink ribbon on the take-up side, and The take-up torque on the side hub was weakened, and the ink ribbon could be picked up by the recording paper, causing printing failure, or the ink ribbon could meander or sag.

Therefore, an object of the present invention is to provide an ink ribbon cassette which is free from the possibility that the ink ribbon is picked up on the recording paper at the time of printing to cause printing failure, and the ink ribbon meanders or sags. .

[0006]

[Means for Solving the Problems]

 The present invention provides a back tension applying means for applying a back tension to the ink ribbon and a slack removing means for removing the slack of the ink ribbon in a cassette that houses a pair of winding and supply hubs for the ink ribbon. In the arranged ink ribbon cassette which can be used in reverse, the back tension applying means is provided with a pair of back tension applying parts each having an ink ribbon abutting part at the tip thereof, and the ink ribbon abutting part is provided at each base end thereof. One back tension applying spring, which is connected to the outside in a substantially U-shape at the connecting portion and is biased in the direction in which the ink ribbon abutting portions are separated from each other, has a predetermined interval, and the interval And a pair of parallel projections into which the coupling portion of the spring is loosely fitted. It is provided parallel to the rear surface side and is provided at the center of the rear surface side, the connecting portion of the spring is loosely fitted in the space, and the pair of back tension applying portions and the ink ribbon contact portions of the pair of winding portions are respectively wound. The above object is achieved by providing an ink ribbon cassette characterized in that it is brought into contact with the surface of each of the ink ribbons in the pickup / supply hub.

[0007]

[Action]

 According to the ink ribbon cassette of the present invention, by the back tension applying means loosely fitted between the pair of protrusions having a predetermined interval, the back tension is increased when the ink ribbon is traveling and the reversing traveling. Since it always acts strongly on the ink ribbon on the take-up hub side, it does not weaken the take-up torque on the take-up hub, and there is no risk of the ink ribbon being taken off by the recording paper and causing printing defects. , Ink ribbon does not meander or sag.

[0008]

【Example】

 An embodiment of the ink ribbon of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the ink ribbon of the present invention. FIG. 1 is a perspective view showing the appearance of the ink ribbon cassette, and FIG. 2 shows the ink ribbon of the ink ribbon cassette shown in FIG. 3 is a plan view of the inside of the cassette shown in FIG. 3, FIG. 3 is a plan view of an essential part showing the relationship of operation between the back tension applying spring and the ink ribbon when the ink ribbon shown in FIG. 1 is running, and FIG. 4 is the ink shown in FIG. FIG. 6 is a plan view of a main part showing an operational relationship between the back tension applying spring and the ink ribbon when the ribbon is reversed and run.

In the ink ribbon cassette of this embodiment, as shown in FIGS. 1 and 2, a back tension is applied to the ink ribbon 1 in a cassette 4 in which a pair of winding / supply hubs 2 and 3 of the ink ribbon 1 are housed. The back tension applying means 5 for applying and the one slack removing spring 6 for removing the slack of the ink ribbon 1 are respectively arranged, and the recesses 4a, 4b facing the print head 7 are formed on the left and right sides of the front surface of the cassette 4, respectively. Therefore, the slack eliminating spring 6 is provided between the recesses 4a and 4b.

The back tension applying means 5 in the ink ribbon cassette of the present invention comprises a back tension applying spring 50 and a pair of parallel protrusions 54 and 55. The back tension applying spring 50 includes a pair of back tension applying portions 51 and 52 and a connecting portion 53. The pair of back tension applying portions 51 and 52 have ink ribbon contact portions 51a and 52a at their tips, respectively, and at the base ends of the back tension applying portions 51 and 52, the ink is abutted by the connecting portion 53. The ribbon abutting portions 51a and 52a are connected to each other in a substantially U-shape so as to face outward, and the ink ribbon abutting portions 51a and 52a are urged in the separating directions. The ink ribbon contact portions 51a and 52a of this embodiment are formed of felt or the like.

The pair of protrusions 54, 55 has a predetermined space L, and is configured to allow the connecting portion 53 of the spring 50 to fit loosely within the space L. It is provided parallel to the rear surface side and provided at the center of the rear surface side. Then, the connecting portion 53 of the spring 50 is loosely fitted in the space L, and as shown in FIG. 2, when the ink ribbon 1 is not running, the ink ribbon abutting portions of the pair of back tension applying portions 51 and 52 are respectively attached. The contact portions 51a and 52a are configured to come into contact with the surfaces of the ink ribbon 1 in the pair of winding / supplying hubs 2 and 3, respectively.

Next, the operation of this embodiment having the above configuration will be described. First, the case of winding the ink ribbon 1 from the winding / supplying hub 3 to the winding / supplying hub 2 will be described. As shown in FIG. 3, the ink ribbon 1 is wound by the winding (supplying) hub 2. When performing the winding, the winding (supply) hub 2 rotates in the arrow X 1 direction. Therefore, since the (winding) supply hub 3 also rotates in the arrow X direction, the back tension applying section 52 contacts the ink ribbon 1 on the (winding) supply hub 3 side. It goes down in the arrow Y direction via the contact portion 52a. At this time, the back tension strongly acts on the ink ribbon 1 on the (winding) supply hub 3 side by the ink ribbon contact portion 52a.

Further, when the back tension imparting portion 52 is lowered in the arrow Y direction, the connecting portion 53 of the back tension imparting spring 50 is loosely fitted between the pair of protrusions 54 and 55. The tension applying portion 51 is pushed up in the arrow Z direction. At this time, the ink ribbon contact portion 51a that is in contact with the ink ribbon 1 on the take-up (supply) hub 2 side is also pushed up in the arrow Z direction. Since the same direction as the arrow X rotation direction, which is the rotation direction of the ink ribbon 1 on the (supply) hub 2 side, the back tension acts weakly on the ink ribbon 1 on the winding (supply) hub 2 side. No upper back tension is applied.

Further, as shown in FIG. 4, when the ink ribbon 1 is wound from the winding / supplying hub 2 to the winding / supplying hub 3, the above-described operation by the operation shown in FIG. The opposite effect occurs. That is, when the ink ribbon 1 is taken up by the take-up (supply) hub 3, the back tension applying spring 50 operates as shown in FIG. The back tension acts strongly on the ribbon 1, but on the winding (supply) hub 3 side, the back tension acts weakly and practically no back tension is applied.

Therefore, according to the ink ribbon cassette of this embodiment, no matter which of the winding / supply hubs 2 and 3 is used as the winding hub, the back tension acts only on the ink ribbon 1 on the supply hub side. Therefore, the winding torque of the take-up hub is not weakened, and there is no fear that the ink ribbon 1 is picked up by the recording paper to cause printing failure, or the ink ribbon 1 meanders or sags. .

The ink ribbon cassette of the present invention is not limited to the one shown in the above embodiment, and for example, the slack eliminating means may be one for removing the slack of the ink ribbon, and the back tension applying means. The felt or the like forming the back tension contact portion can be appropriately changed to another material or the like without departing from the spirit of the present invention.

[0017]

[Effect of the device]

 In the ink ribbon cassette of the present invention, there is no possibility that the ink ribbon is picked up on the recording paper at the time of printing to cause printing failure, and the ink ribbon meanders or sags.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of an ink ribbon cassette according to an embodiment of the present invention.

FIG. 2 is a plan view of the inside of the ink ribbon cassette of the embodiment shown in FIG. 1 when the cassette is not running.

FIG. 3 is a plan view of a main part showing an operational relationship between a back tension applying spring and an ink ribbon when the ink ribbon of the embodiment shown in FIG. 1 is running.

FIG. 4 is a plan view of a main part showing an operational relationship between a back tension applying spring and an ink ribbon when the ink ribbon of the embodiment shown in FIG.

[Explanation of symbols]

 1 Ink Ribbon 2 Winding / Supply Hub 3 Winding / Supply Hub 4 Cassette 5 Back Tension Applying Means 50 Back Tension Applying Spring 51 Back Tension Applying Part 52 Back Tension Applying Part 51a Ink Ribbon Abutting Part 52a Ink Ribbon Abutting Part 53 Connection part of back tension application part 54 Protrusion 55 Protrusion L Predetermined interval 6 Deflection spring X Rotation direction of winding / supply hub Y Direction of force applied to back tension application part Z Direction of force applied to back tension application part

Claims (1)

[Scope of utility model registration request] 1. A back tension applying means for applying a back tension to the ink ribbon and a slack removing means for removing the slack of the ink ribbon are arranged in a cassette containing a pair of winding and supply hubs for the ink ribbon. did,
In an ink ribbon cassette that can be used upside down, the back tension applying means includes a pair of back tension applying parts each having an ink ribbon abutting part at its tip end, and the ink ribbon abutting part is directed outward at each base end. And a back tension applying spring that is connected in a substantially U-shape at a connecting portion and is biased in a direction in which the ink ribbon abutting portions are separated from each other, and has a predetermined interval, and the spring is provided within the interval. The connecting portion is formed by a pair of parallel protrusions that are loosely fitted, and the pair of protrusions are provided in the center of the rear surface side in parallel with the rear surface side in the cassette, and the connecting portion of the spring is within the interval. The ink ribbon abutting portions of the pair of back tension applying portions are loosely fitted and the pair of winding and
An ink ribbon cassette, characterized in that it is brought into contact with the surfaces of the ink ribbons in the supply hub.